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This instrument consists merely of the barrel of a medicine dropper fitted air tight, by means of a perforated stopper, into the barrel of a pointed glass urethral syringe as shown in illustration.
The tubing on a fountain syringe is cut near the bag and the apparatus is inserted between the cut ends. The liquid can be seen as it drops from the glass tip to the bottom of the air space in the syringe barrel. A small stopcock is put in the rubber tubing between the apparatus and the rubber bag. One may readily adjust the stopcock so as to get a steady stream or only a few drops each minute. A small catheter is attached to the rubber tubing and inserted into the rectum as is usually done.
This apparatus has the advantage over the old style of partially grasping the tube with an artery clamp because after
LAWSON GB. AN INSTRUMENT FOR ACCURATELY REGULATING THE AMOUNT OF FLUIDS GIVEN SLOWLY BY RECTUM. JAMA. 1908;L(16):1267. doi:10.1001/jama.1908.25310420035002d
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